Linus tale



. of the town of Newport, county of mer, and State of New York, have invented a new and Improved Safety-Lock for Banks;` Safes,"Vaults, Stores, &c., called Yales` UMTED (STATES PATENT OFFICE, n N

. LINUSVYALE, JR., or NEWPORT. NEw YORK.

LooK `AND KEY.

specificati@ of Letters Patent No. 8,071,` dated `May e, `1851.

To all whom, t may concern:

Be it known that I, LINUS YALE, Jr.,

Herki- Self Detaching and Attaching Key-Lock; and I herebydeclare thefollowing to be a full and exact description, reference being had to the annexed drawings, the` same letters referring to like parts in the different Y figures.

In the front plate of the lock A, Figure 2, and e-ven with it on the back or inside, is inserted a wheel B, having a hub projecting suliiciently to reach through the door it is intended to secure. This wheel is pierced with a square mortise or key hole in its center, for the `wrench part of the key to turn it by;` On the back near its outer edge, is inserted a driving pin C, Fig. 6, of sufficient strength to drive the` key carriage D, Fig. 3, by mea-nsof the slot or mortise E, in which it works, thereby moving both the key-carriage D and bolt-plate F, Fig. 5. Also in theback of said wheel is a countersink of the depth `of the dovetail in the key,

`and sloped outwardly forming an inclined Immediately behind and bearing against j the front plate and wheel above described is the cut-ofi"plate or key-carriage D, Fig. 3`

Y? with an upright slot E, in which the driving pin C works. Also a projection G, bac-k, containing a chamber H, Fig. 7, for the pod of the key, in which it is carried to the latches N, Fig. 5. In the center of this keychamber is a pin l, Fig. 7, to drive back the dowel in the keyto the exact line of division, said chamber `being open in the `front end only when closed to the latches and open on the top only when closed in the front direction. Around the stud or pin in itscenter is a coiled spring J, Fig. 7, which serves to keep the key pod pressed against the varied surface of the wheel. The projection on the back has also a notch on its corner by means of which and a latch hereinafter described, it drives the bolt `plate out in locking.

The bolt plate Fig. 5 slides against `the back of the lock and is left projecting out of the lock sutliciently to receive the upright bar on which are the bolts of the door. It has a track L, with shouldered stops on which rides the keyfcarriage, said track projecting to the cut-off plate in front. It has also a pin M, on which are hung` from latches N, `and `a `hook latch O, said latches being pressed down by springs P, on another stud or pinQ." Through this plate are two horizontal slots fR and S, through which project respectively fromthe back plate Fig. l a ledge orshelf T, and afence pin U. The ledge or shelf serves to cover the inner opening ofthe key chamber, while it is open outwardly. The fence pin stops the latches, and therefore the bolt, unless the proper key occupies the chamber, said latches having jaWsto receive the fence pin when placed in line by the right key.` y.

The back plate Fig. 4, is held in place by the `corner pillars V, V, V, V, and contains the above described edge or shelf, and fence pin -projecting through the bolt plate to the cutol'l plate, as seen in section, Fig. 7. l..

W, the key, consists of'iive parts, Fig. l.

The pod X, containing the different planes dovetail `whichis held from unseasonably so y disengaging by the dowel pin Z, driven through it by the spiral spring &, lin the shaft secured there by the handle `being screwed in after.

To unlock, insert the key W through the square Vrnortise in front, gently pressingv to overcome the tendency of the spring in the key to throwit out. The stud in the key chamber causes the dowel in thekeyto re`" cede to the plane of the dovet'ail. Turn the key to the right and the motion thus given :i

to the wheelmoves, by meansof the pin C,

`in the slot E, the key chamber and pod to the right, bringing a :blank surface of the cut-off plate across the key hole, and carrying the chamber and pod from under the shelf T, allowing the latches N,toffa`ll upon the key thereby arranging them in `a proper manner to stride the fence pin U, allowing them both to move with the key carriage,

being driven back by the projection on the back ofthe key carriage striking the stop on the track L, Fig. 5. To lock it, reverse the motion of the key. The hook O, Fig. 5, having dropped into the notch in the cornerof the key chamber forces the boltoutl ward until the latches are free from the fence pin U, when they are all raised up by the shelf or ledge T, and leaving the bolt,

the key-carriage continues moving forward till the pod is redovetailed to the shaft. Withdrawing the key allows the pin which holds the dovetail to cross the plane of the joint and it is thus secured in place till again inserted in the lock. Thus the proper key is applied to the lock with the same facility, as an ordinary key to an ordinary lock, without there even being an exposure of the latches to sight or feeling, thereby preventing the possibility of its being picked-or the introduction of suiicient powder to open the lock.

Wha-t I claim as my invention and desire to secure by Letters Patent isl. The self detaching and attaching key for the purpose and object described.

2. In combination with said key I claim a powder proof key hole consisting of two or more parts so constructed that the outer part is turned by the key; while at the same time the inner parts with the pod or pods of the key inclosed, are disconnected and moved entirely away from the outer, the same movement causing solid metal to occupy the space left and thus to eiectually bar an entrance of any kind to the lock when its parts are in a position possible to be unlocked.

LINUS YALE, JR.

Witnesses: Y

JOHN H. WoosTER, IRA L. CADY. 

